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powerpc/sstep: Fix darn emulation

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Commit 8813ff49607e ("powerpc/sstep: Check instruction validity
against ISA version before emulation") introduced a proper way to skip
unknown instructions. This makes sure that the same is used for the
darn instruction when the range selection bits have a reserved value.

Fixes: a23987ef267a ("powerpc: sstep: Add support for darn instruction")
Signed-off-by: Sandipan Das <sandipan@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210204080744.135785-2-sandipan@linux.ibm.com
This commit is contained in:
Sandipan Das 2021-02-04 13:37:44 +05:30 committed by Michael Ellerman
parent bbda4b6c7d
commit 22b89ba178
1 changed files with 1 additions and 1 deletions
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2
arch/powerpc/lib/sstep.c
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@ -1916,7 +1916,7 @@ int analyse_instr(struct instruction_op *op, const struct pt_regs *regs,
goto compute_done;
}
return -1;
goto unknown_opcode;
#ifdef __powerpc64__
case 777: /* modsd */
if (!cpu_has_feature(CPU_FTR_ARCH_300))